package com.rong.ruiji.controller;

import com.rong.ruiji.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;

/**
 * 文件上传和下载
 */
@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {

    @Value("${ruiji.path}")
    private String basePath ;

    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) {

        //目录不存在，先进行创建
        File dir = new File(basePath);
        if(!dir.exists()) {
            dir.mkdirs();
        }

        //原始文件名
        String originalFilename = file.getOriginalFilename();
        String type = originalFilename.substring(originalFilename.lastIndexOf("."));
        //防止文件名重复，使用uuid
        String fileName = UUID.randomUUID().toString() + type ;
        try {
            file.transferTo(new File(basePath+fileName));
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

        return R.success(fileName);

    }


    /**
     * 文件下载
     * @param name
     * @param response
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response) throws IOException {
        FileInputStream inputStream = null;
        ServletOutputStream outputStream = null;
            try {
                //输入流，读取文件内容
                 inputStream = new FileInputStream(new File(basePath+name));
                //输出流，将文件写回浏览器，在浏览器展示图片
                outputStream = response.getOutputStream();
                int len = 0 ;
                byte[] bytes = new byte[1024];
                while ((len = inputStream.read(bytes)) != -1) {
                    outputStream.write(bytes,0,len);
                    outputStream.flush();
                }


            }catch (Exception e){
                e.printStackTrace();

            }finally {
                if(inputStream != null) {
                    inputStream.close();
                }
                if(outputStream != null) {
                    outputStream.close();
                }

            }
    }

}
